There are a number of different spring design possibilities for a given application, we strongly suggest you to consult with a Ming-Tai engineer early in the design phase.
Please work through the product specifications list below, submit your information to Ming Tai. We will create an optimized motor carbon brush spring to meet your demand.

Advantages of Twin Coil Comparing with Single Coil
1. To afford maximum brush lengtth and double the load of single coil
2. To allows a minimun motor size
3. To offer better load for its symmetry